package com.xtgg.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.os.Environment;

public class FileUtils {
	private String SDPATH;

	private int FILESIZE = 4 * 1024;

	public String getSDPATH() {
		return SDPATH;
	}

	public FileUtils() {
		// 得到当前外部存储设备的目录( /SDCARD )
		SDPATH = Environment.getExternalStorageDirectory() + "/";
	}

	/**
	 * 在SD卡上创建文件
	 * 
	 * @param fileName
	 * @return
	 * @throws IOException
	 */
	public File createSDFile(String fileName) throws IOException {
		File file = new File(SDPATH + fileName);
		file.createNewFile();
		return file;
	}

	/**
	 * 在SD卡上创建目录
	 * 
	 * @param dirName
	 * @return
	 */
	public File createSDDir(String dirName) {
		File dir = new File(SDPATH + dirName);
		dir.mkdir();
		return dir;
	}

	/**
	 * 判断SD卡上的文件夹是否存在
	 * 
	 * @param fileName
	 * @return
	 */
	public boolean isFileExist(String fileName) {
		File file = new File(SDPATH + fileName);
		if (file.exists())
			file.delete();
		return false;
	}

	/**
	 * 将一个InputStream里面的数据写入到SD卡中
	 * 
	 * @param path
	 * @param fileName
	 * @param input
	 * @return
	 */
	public File write2SDFromInput(String path, String fileName,
			InputStream input) {
		File file = null;
		OutputStream output = null;
		try {
			createSDDir(path);
			file = createSDFile(path + fileName);
			output = new FileOutputStream(file);
			byte[] buffer = new byte[FILESIZE];

			/*
			 * 真机测试，这段可能有问题，请采用下面网友提供的 while((input.read(buffer)) != -1){
			 * output.write(buffer); }
			 */

			/* 网友提供 begin */
			int length;
			while ((length = (input.read(buffer))) > 0) {
				output.write(buffer, 0, length);
			}
			/* 网友提供 end */

			output.flush();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				output.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return file;
	}

}
